[Intel-gfx] [PATCH] Fix intel_detect_pch() to work in xen environment.

[G.R.]

On Wed, Dec 19, 2012 at 2:20 AM, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
>> >
>> > I'd like to see a comment about this being for Xen in here, and I
>> > wonder if there are other places where we might have to worry about the
>> > Xen implementation.  In that case, setting a flag in dev_priv when we
>> > don't find the PCH where we expect would be a good idea too.
>> >
>>
>> I can add a comment here if the overall idea is acceptable to you.
>> But there is already a comment mentioning that the ISA bridge check is
>> for virtualization:
>>
>>  404         /*
>>  405          * The reason to probe ISA bridge instead of Dev31:Fun0 is to
>>  406          * make graphics device passthrough work easy for VMM, that only
>>  407          * need to expose ISA bridge to let driver know the real hardware
>>  408          * underneath. This is a requirement from virtualization team.
>>  409          */
>>
>> > Ack on the general idea though; I'd like us to be able to run under Xen
>> > without modification.
>> >
>>
>> Stefano may be able to comment if it's feasible to achieve zero
>> modification in this case.
>> I believe this has something to do with getting rid of the PIIX3
>> device provided by qemu.
>>
>> But generally I think it's very hard to achieve perfect emulation.
>> You can't always foresee what assumption a guest driver would make.
>> Maybe we need some compromise.
>
> I meant that I'd like to see any other patches required for Xen get
> merged, that way people won't have to patch their kernels for i915
> under Xen.

Hi Jesse, I think I need to resend the patch with proper comment to
have it formally accepted.
Any guide line for formal patch submission? Do I need to start a
separate thread?